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2005 Mercury Sable Buzzing/Rattling Sound

There is an intermittent buzzing/rattling sound coming from the passenger side inside the engine compartment of my 2005 Sable. At first I thought it was only when the a/c was on (although the a/c is working fine) but then I noticed it does it after running the a/c for a bit and then turning it off. I popped the hood and noticed quite a bit of moisture and wetness to the right of where you add engine coolant. Any ideas?

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